chore: gitignore every Eclipse JDT produced file and folder (#2195)

.settings and others show up when using the Claude Code with Java LSP
provided by the JDT-LS project.

Author: triceo

.gitignore

@@ -2,13 +2,12 @@ target
 local
 
 # Eclipse, Netbeans and IntelliJ files
-/.*
+.*
 !/.github
-!/.specify
 !/.ci
+!/.mvn
 !.gitignore
 !.gitattributes
-!/.mvn
 /nbproject
 *.ipr
 *.iws